Beyonce's bitch'n post-baby body is SO hot it's causing more people to question validity of her pregnancy. Like, the gurl looks to damn good for have JUST had Baby Blue six weeks ago!

Howves, from what we hear, Bey's secret isn't surrogate — it's a LIVE IN trainer!

That's right her trainer , Marco Borges, has MOVED into her home, with her family, so he lead her daily workouts. Marco wakes up Mommonce at 5 a.m. for a fun two-hour workout, which they do AGAIN at 5 p.m.

A source says:

“They do a mix of cardio, Pilates, plyometrics, yoga and, of course, dance.”

She's also on a strict diet. The new mom is eating six small, high-protein meals a day — and NO snaking. Blue's mom is so not playing around about losing that weight. Our source says she hopes to drop from 170lbs turns into 128lbs by early March.

Knowing Beymom working out like a beast makes her crazyass transformation seem a tad more fair.

Still, it'd be nice if ALL new moms could have that kind of money and free time….